target/alpha/mem_helper.c

   1 /*
   2  *  Helpers for loads and stores
   3  *
   4  *  Copyright (c) 2007 Jocelyn Mayer
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "cpu.h"
  22 #include "exec/helper-proto.h"
  23 #include "exec/exec-all.h"
  24 #include "exec/cpu_ldst.h"
  25
  26 /* Softmmu support */
  27 #ifndef CONFIG_USER_ONLY
  28 void alpha_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
  29                                    MMUAccessType access_type,
  30                                    int mmu_idx, uintptr_t retaddr)
  31 {
  32     AlphaCPU *cpu = ALPHA_CPU(cs);
  33     CPUAlphaState *env = &cpu->env;
  34     uint64_t pc;
  35     uint32_t insn;
  36
  37     cpu_restore_state(cs, retaddr);
  38
  39     pc = env->pc;
  40     insn = cpu_ldl_code(env, pc);
  41
  42     env->trap_arg0 = addr;
  43     env->trap_arg1 = insn >> 26;                /* opcode */
  44     env->trap_arg2 = (insn >> 21) & 31;         /* dest regno */
  45     cs->exception_index = EXCP_UNALIGN;
  46     env->error_code = 0;
  47     cpu_loop_exit(cs);
  48 }
  49
  50 void QEMU_NORETURN
  51 alpha_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr,
  52                                 vaddr addr, unsigned size,
  53                                 MMUAccessType access_type,
  54                                 int mmu_idx, MemTxAttrs attrs,
  55                                 MemTxResult response, uintptr_t retaddr)
  56 {
  57     AlphaCPU *cpu = ALPHA_CPU(cs);
  58     CPUAlphaState *env = &cpu->env;
  59
  60     cpu_restore_state(cs, retaddr);
  61
  62     env->trap_arg0 = addr;
  63     env->trap_arg1 = access_type == MMU_DATA_STORE ? 1 : 0;
  64     cs->exception_index = EXCP_MCHK;
  65     env->error_code = 0;
  66     cpu_loop_exit(cs);
  67 }
  68
  69 /* try to fill the TLB and return an exception if error. If retaddr is
  70    NULL, it means that the function was called in C code (i.e. not
  71    from generated code or from helper.c) */
  72 /* XXX: fix it to restore all registers */
  73 void tlb_fill(CPUState *cs, target_ulong addr, MMUAccessType access_type,
  74               int mmu_idx, uintptr_t retaddr)
  75 {
  76     int ret;
  77
  78     ret = alpha_cpu_handle_mmu_fault(cs, addr, access_type, mmu_idx);
  79     if (unlikely(ret != 0)) {
  80         /* Exception index and error code are already set */
  81         cpu_loop_exit_restore(cs, retaddr);
  82     }
  83 }
  84 #endif /* CONFIG_USER_ONLY */